etnaviv fails probe early, but succeeds after rmmod && modprobe

[Lucas Stach]

Hi Josua,

Am Freitag, dem 16.04.2021 um 11:34 +0200 schrieb Ing. Josua Mayer:
> Greetings everybody,
> 
> While testing Debian on the i.MX6 HummingBoard, I came across a problem 
> where after boot, the /dev/dri/card1 representing the GC2000 does not exist.
> 
> However at that point issuing
> rmmod etnaviv; modprobe etnaviv
> succeeds and I can then go on running applications uing GL.
> 
> So I am very unsure how to debug this. What I have so far is this output 
> from dmesg [1], which points at some deferred probing timeout behaviour.
> I do not know how to trace
> (1) whose timeout exceeded
> (2) what dependency is being ignored
> (3) why after 3 attempts probing apparently gives up
> I do know that this problem is shared with the coda driver, which fails 
> the same way. Hence maybe this is not an etnaviv problem - but hopefully 
> this message can still reach somebody who understands what is happening 
> here.

I have no idea how this deferred probe timeout stuff works, but from
your logs it seems vddpu gets probed really late (is the anatop
regulator driver a module in your config?), which in turn would cause a
probe defer of the GPC power domain driver, which is a common
dependency between VPU and GPU on the i.MX6. Seems like those etnaviv
timeouts happen before the GPC driver had a chance to probe.

Regards,
Lucas


> Yours sincerely
> Josua Mayer
> 
> [1] short dmesg (full dmesg attached):
> root at sr-imx6:~# dmesg | grep etna
> [    5.969888] etnaviv-gpu 130000.gpu: deferred probe timeout, ignoring 
> dependency
> [    5.985970] etnaviv-gpu: probe of 130000.gpu failed with error -110
> [    6.076604] etnaviv-gpu 134000.gpu: deferred probe timeout, ignoring 
> dependency
> [    6.102833] etnaviv-gpu: probe of 134000.gpu failed with error -110
> [    6.121231] etnaviv-gpu 2204000.gpu: deferred probe timeout, ignoring 
> dependency
> [    6.150314] etnaviv-gpu: probe of 2204000.gpu failed with error -110
> root at sr-imx6:~# rmmod etnaviv
> root at sr-imx6:~# modprobe etnaviv
> root at sr-imx6:~# dmesg | grep etna
> ...
> [  166.482349] etnaviv etnaviv: bound 130000.gpu (ops gpu_ops [etnaviv])
> [  166.502064] etnaviv etnaviv: bound 134000.gpu (ops gpu_ops [etnaviv])
> [  166.514261] etnaviv etnaviv: bound 2204000.gpu (ops gpu_ops [etnaviv])
> [  166.520868] etnaviv-gpu 130000.gpu: model: GC2000, revision: 5108
> [  166.527630] etnaviv-gpu 134000.gpu: model: GC320, revision: 5007
> [  166.533879] etnaviv-gpu 2204000.gpu: model: GC355, revision: 1215
> [  166.540048] etnaviv-gpu 2204000.gpu: Ignoring GPU with VG and FE2.0
> [  166.547379] [drm] Initialized etnaviv 1.3.0 20151214 for etnaviv on 
> minor 1
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